As a follow up, I can also give advise on where not to purchase a Bluechart CD from:
also known as Adrenaline Chandlery
Despite several e-mails to clarify exactly what I wanted they sent me a Bluechart Data Card rather than the CD. They have a problem with their supplier, which is not my problem, and they are saying that the supplier won't take it back, despite it still being sealed.
I have had to revert to Visa's legal services to sort it out so that I can resolve it.........be warned!!!